Dell PowerConnect 2748 User Manual

Appendix A: Configuration Examples

This Appendix provides some configuration examples for the PowerConnect 2708/2716/2724
devices installed in the Enterprise Network.

The following configuration scenarios are described:

• Configuring Interface Parameters

• Creating VLAN Membership

• Configuring VLAN Port Settings

• Configuring LAG Membership

• Downloading Software File

• Configuring Port Mirroring

• Configuring Storm Control

• Configuring CoS Priority Queues

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Configuring Interface Parameters

The Interface Configuration screen enables the user to set the various interface parameters,
interface type and additional operational attributes. In the following example, Port 1 is configured
as 1000Mbps Copper interface type, as maximum speed and interface media type. The appropriate
cable type connection is RJ-45 1 Gigabit connection.

The Admin Status is Enabled, therefore traffic is forwarded through the port. The Current
Interface Speed is 10 Mbps as the actual synchronized interface speed. The Admin Duplex mode is
Full Duplex (FDX), supporting transmission in both directions, while the Current Duplex Mode is
configured at Half Duplex (HDX), supporting transmission between the device and the other
station in one direction only. Auto-Negotiation is Enabled, Backpressure is set at Disable, and Flow

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Control is set at Disable.

Figure 9-1. Interface Configuration

VLANs

VLANs are logical subgroups within a Local Area Network (LAN) that combine user stations and
network devices into a single brodcast domain, regardless of the physical LAN segment to which
they are attached.

VLANs allow network traffic to flow more efficiently within subgroups. VLANs managed through
software reduce the amount of time network changes, additions, and moves are implemented. Port­based VLANs are comprised of a set of ports that make up a Layer 2 broadcast domain.

The following figure illustrates the concept of VLANs in the Enterprise Network. In this example,
Finance, Marketing and R&D departments are configured as three distinct VLANs in the
enterprise, designated as VLAN #2, VLAN#3 and VLAN#4, respectively.

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Figure 9-2. Port-Based VLANs in the Enterprise

Creating VLAN Membership

VLANs are collections of switching ports that comprise a single broadcast domain. Packets are
classified as belonging to a VLAN based on either the VLAN tag, or a combination of the ingress
port and packet contents. Packets sharing common attributes can be grouped in the same VLAN.

VLAN tagging provides a method of transferring VLAN information between VLAN groups. VLAN
tagging attaches a 4-byte tag to packet headers. The VLAN tag indicates to which VLAN the packet
belongs. VLAN tags are attached to the packets by either the end station or by the network device.
VLAN tags also contains VLAN network priority information.

VLAN membership is used to partition traffic into several mutually exclusive broadcast domains.
VLAN membership facilitates greater security and pre-defined access levels of user groups in
separate departments.

The VLAN Membership
device supports the mapping of 4094 VLAN IDs to 64 VLANs. All ports must have a defined PVID.
If no other value is configured the default VLAN PVID is used. VLAN ID #1 is the default VLAN,
and cannot be deleted from the system.

The VLAN Membership screen enables the user to select an existing VLAN, create a new VLAN
with port numbers, create a new VLAN port membership, or remove an existing VLAN.

VLAN Membership ports can be defined as Untag Egress packets, Tag Egress packets, or they can
be defined as Not Member.

Web Management page contains fields for defining VLAN groups. The

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Figure 9-3. VLAN Membership

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Defining VLAN Port Settings

The VLAN Port Settings screen enables the user to configure information for a specific port in a
LAG. In the following example, port #2 in LAG Group 1, has the Frame Type as Admit All, and
Ingress Filtering is Disabled.

The follwing screen shows the specific status information relevant to a specific port, and global
status information relevant to all ports.

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Figure 9-4. VLAN Port Settings

LAGs

A Link Aggregated Group (LAG) is composed of ports with the same speed, set to full-duplex
operation. Up to six Aggregated Links may be defined, each with up to four member ports, to form
a single Link Aggregated Group (LAG). This enables:

• Fault tolerance protection from physical link disruption

• Higher bandwidth connections

• Improved bandwidth granularity

• High bandwidth server connectivity

With the departmental PowerConnect 2708/2716/2724 switches installed, network redundancy and
improved traffic performance are facilitated. The PowerConnect device serves to connect the
departmental groups of users to another switch that is located on another floor. In addition, LAGs
are used to ensure that a backup, in case one line is disabled.

The following figure illustrates the concept of Aggragated Links in the switch.

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